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Title: Mid-infrared Variability of Changing-look AGNs

Abstract

It is known that some active galactic nuclei (AGNs) transit from Type 1 to Type 2 or vice versa. There are two explanations for the so-called changing-look AGNs: one is the dramatic change of the obscuration along the line of sight, and the other is the variation of accretion rate. In this Letter, we report the detection of large amplitude variations in the mid-infrared luminosity during the transitions in 10 changing-look AGNs using the Wide-field Infrared Survey Explorer ( WISE ) and newly released Near-Earth Object WISE Reactivation data. The mid-infrared light curves of 10 objects echo the variability in the optical band with a time lag expected for dust reprocessing. The large variability amplitude is inconsistent with the scenario of varying obscuration, rather it supports the scheme of dramatic change in the accretion rate.

Authors:
; ; ; ;  [1];  [2];  [3]
  1. CAS Key Laboratory for Researches in Galaxies and Cosmology, University of Sciences and Technology of China, Hefei, Anhui 230026 (China)
  2. Caltech Optical Observatories, Cahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125 (United States)
  3. Center for Astrophysics, Guangzhou University, Guangzhou 510006 (China)
Publication Date:
OSTI Identifier:
22654397
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 846; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; AMPLITUDES; DETECTION; DUSTS; GALAXIES; GALAXY NUCLEI; INFRARED SURVEYS; INTERMEDIATE INFRARED RADIATION; LUMINOSITY; REGENERATION; REPROCESSING; VARIATIONS; VISIBLE RADIATION

Citation Formats

Sheng, Zhenfeng, Wang, Tinggui, Jiang, Ning, Yang, Chenwei, Peng, Bo, Yan, Lin, and Dou, Liming, E-mail: shengzf@mail.ustc.edu.cn, E-mail: twang@ustc.edu.cn. Mid-infrared Variability of Changing-look AGNs. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA85DE.
Sheng, Zhenfeng, Wang, Tinggui, Jiang, Ning, Yang, Chenwei, Peng, Bo, Yan, Lin, & Dou, Liming, E-mail: shengzf@mail.ustc.edu.cn, E-mail: twang@ustc.edu.cn. Mid-infrared Variability of Changing-look AGNs. United States. doi:10.3847/2041-8213/AA85DE.
Sheng, Zhenfeng, Wang, Tinggui, Jiang, Ning, Yang, Chenwei, Peng, Bo, Yan, Lin, and Dou, Liming, E-mail: shengzf@mail.ustc.edu.cn, E-mail: twang@ustc.edu.cn. Fri . "Mid-infrared Variability of Changing-look AGNs". United States. doi:10.3847/2041-8213/AA85DE.
@article{osti_22654397,
title = {Mid-infrared Variability of Changing-look AGNs},
author = {Sheng, Zhenfeng and Wang, Tinggui and Jiang, Ning and Yang, Chenwei and Peng, Bo and Yan, Lin and Dou, Liming, E-mail: shengzf@mail.ustc.edu.cn, E-mail: twang@ustc.edu.cn},
abstractNote = {It is known that some active galactic nuclei (AGNs) transit from Type 1 to Type 2 or vice versa. There are two explanations for the so-called changing-look AGNs: one is the dramatic change of the obscuration along the line of sight, and the other is the variation of accretion rate. In this Letter, we report the detection of large amplitude variations in the mid-infrared luminosity during the transitions in 10 changing-look AGNs using the Wide-field Infrared Survey Explorer ( WISE ) and newly released Near-Earth Object WISE Reactivation data. The mid-infrared light curves of 10 objects echo the variability in the optical band with a time lag expected for dust reprocessing. The large variability amplitude is inconsistent with the scenario of varying obscuration, rather it supports the scheme of dramatic change in the accretion rate.},
doi = {10.3847/2041-8213/AA85DE},
journal = {Astrophysical Journal Letters},
number = 1,
volume = 846,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}